Commit 763ce1c485

@@ -10,6 +10,11 @@
 
 #include <unistd.h>
 #include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <stdio.h>
+#include <fcntl.h>
 
 void os_spawn_process(const char *exe, ZigList<const char *> &args, bool detached) {
     pid_t pid = fork();
@@ -32,6 +37,24 @@ void os_spawn_process(const char *exe, ZigList<const char *> &args, bool detache
     zig_panic("execvp failed: %s", strerror(errno));
 }
 
+static void read_all_fd(int fd, Buf *out_buf) {
+    static const ssize_t buf_size = 8192;
+    buf_resize(out_buf, buf_size);
+    ssize_t actual_buf_len = 0;
+    for (;;) {
+        ssize_t amt_read = read(fd, buf_ptr(out_buf), buf_len(out_buf));
+        if (amt_read < 0)
+            zig_panic("fd read error");
+        actual_buf_len += amt_read;
+        if (amt_read == 0) {
+            buf_resize(out_buf, actual_buf_len);
+            return;
+        }
+
+        buf_resize(out_buf, actual_buf_len + buf_size);
+    }
+}
+
 void os_path_split(Buf *full_path, Buf *out_dirname, Buf *out_basename) {
     int last_index = buf_len(full_path) - 1;
     if (last_index >= 0 && buf_ptr(full_path)[last_index] == '/') {
@@ -49,3 +72,64 @@ void os_path_split(Buf *full_path, Buf *out_dirname, Buf *out_basename) {
     buf_init_from_buf(out_basename, full_path);
 }
 
+void os_exec_process(const char *exe, ZigList<const char *> &args,
+        int *return_code, Buf *out_stderr, Buf *out_stdout)
+{
+    int stdin_pipe[2];
+    int stdout_pipe[2];
+    int stderr_pipe[2];
+
+    int err;
+    if ((err = pipe(stdin_pipe)))
+        zig_panic("pipe failed");
+    if ((err = pipe(stdout_pipe)))
+        zig_panic("pipe failed");
+    if ((err = pipe(stderr_pipe)))
+        zig_panic("pipe failed");
+
+    pid_t pid = fork();
+    if (pid == -1)
+        zig_panic("fork failed");
+    if (pid == 0) {
+        // child
+        if (dup2(stdin_pipe[0], STDIN_FILENO) == -1)
+            zig_panic("dup2 failed");
+
+        if (dup2(stdout_pipe[1], STDOUT_FILENO) == -1)
+            zig_panic("dup2 failed");
+
+        if (dup2(stderr_pipe[1], STDERR_FILENO) == -1)
+            zig_panic("dup2 failed");
+
+        const char **argv = allocate<const char *>(args.length + 2);
+        argv[0] = exe;
+        argv[args.length + 1] = nullptr;
+        for (int i = 0; i < args.length; i += 1) {
+            argv[i + 1] = args.at(i);
+        }
+        execvp(exe, const_cast<char * const *>(argv));
+        zig_panic("execvp failed: %s", strerror(errno));
+    } else {
+        // parent
+        close(stdin_pipe[0]);
+        close(stdout_pipe[1]);
+        close(stderr_pipe[1]);
+
+        waitpid(pid, return_code, 0);
+
+        read_all_fd(stdout_pipe[0], out_stdout);
+        read_all_fd(stderr_pipe[0], out_stderr);
+
+    }
+}
+
+void os_write_file(Buf *full_path, Buf *contents) {
+    int fd;
+    if ((fd = open(buf_ptr(full_path), O_CREAT|O_CLOEXEC|O_WRONLY|O_TRUNC, S_IRWXU)) == -1)
+        zig_panic("open failed");
+    ssize_t amt_written = write(fd, buf_ptr(contents), buf_len(contents));
+    if (amt_written != buf_len(contents))
+        zig_panic("write failed: %s", strerror(errno));
+    if (close(fd) == -1)
+        zig_panic("close failed");
+}

@@ -12,8 +12,12 @@
 #include "buffer.hpp"
 
 void os_spawn_process(const char *exe, ZigList<const char *> &args, bool detached);
+void os_exec_process(const char *exe, ZigList<const char *> &args,
+        int *return_code, Buf *out_stderr, Buf *out_stdout);
 
 void os_path_split(Buf *full_path, Buf *out_dirname, Buf *out_basename);
 
+void os_write_file(Buf *full_path, Buf *contents);
+
 
 #endif

@@ -1,1 +0,0 @@
-int add(int a, int b);

@@ -1,3 +0,0 @@
-export fn add(a: i32, b: i32) -> i32 {
-    return a + b;
-}

@@ -0,0 +1,144 @@
+/*
+ * Copyright (c) 2015 Andrew Kelley
+ *
+ * This file is part of zig, which is MIT licensed.
+ * See http://opensource.org/licenses/MIT
+ */
+
+#include "list.hpp"
+#include "buffer.hpp"
+#include "os.hpp"
+
+#include <stdio.h>
+
+struct TestSourceFile {
+    const char *relative_path;
+    const char *text;
+};
+
+struct TestCase {
+    const char *case_name;
+    const char *output;
+    const char *source;
+    ZigList<const char *> compile_errors;
+    ZigList<const char *> compiler_args;
+    ZigList<const char *> program_args;
+};
+
+ZigList<TestCase*> test_cases = {0};
+const char *tmp_source_path = ".tmp_source.zig";
+const char *tmp_exe_path = "./.tmp_exe";
+
+static void add_simple_case(const char *case_name, const char *source, const char *output) {
+    TestCase *test_case = allocate<TestCase>(1);
+    test_case->case_name = case_name;
+    test_case->output = output;
+    test_case->source = source;
+
+    test_case->compiler_args.append("build");
+    test_case->compiler_args.append(tmp_source_path);
+    test_case->compiler_args.append("--output");
+    test_case->compiler_args.append(tmp_exe_path);
+    test_case->compiler_args.append("--release");
+    test_case->compiler_args.append("--strip");
+
+    test_cases.append(test_case);
+}
+
+static void add_all_test_cases(void) {
+    add_simple_case("hello world with libc", R"SOURCE(
+        #link("c")
+        extern {
+            fn puts(s: *mut u8) -> i32;
+            fn exit(code: i32) -> unreachable;
+        }
+
+        fn _start() -> unreachable {
+            puts("Hello, world!");
+            exit(0);
+        }
+    )SOURCE", "Hello, world!\n");
+
+    add_simple_case("function call", R"SOURCE(
+        #link("c")
+        extern {
+            fn puts(s: *mut u8) -> i32;
+            fn exit(code: i32) -> unreachable;
+        }
+
+        fn _start() -> unreachable {
+            this_is_a_function();
+        }
+
+        fn this_is_a_function() -> unreachable {
+            puts("OK");
+            exit(0);
+        }
+    )SOURCE", "OK\n");
+}
+
+static void run_test(TestCase *test_case) {
+    os_write_file(buf_create_from_str(tmp_source_path), buf_create_from_str(test_case->source));
+
+    Buf zig_stderr = BUF_INIT;
+    Buf zig_stdout = BUF_INIT;
+    int return_code;
+    os_exec_process("./zig", test_case->compiler_args, &return_code, &zig_stderr, &zig_stdout);
+
+    if (return_code != 0) {
+        printf("\nCompile failed with return code %d:\n", return_code);
+        printf("zig");
+        for (int i = 0; i < test_case->compiler_args.length; i += 1) {
+            printf(" %s", test_case->compiler_args.at(i));
+        }
+        printf("\n");
+        printf("%s\n", buf_ptr(&zig_stderr));
+        exit(1);
+    }
+
+    Buf program_stderr = BUF_INIT;
+    Buf program_stdout = BUF_INIT;
+    os_exec_process(tmp_exe_path, test_case->program_args, &return_code, &program_stderr, &program_stdout);
+
+    if (return_code != 0) {
+        printf("\nProgram exited with return code %d:\n", return_code);
+        printf("zig");
+        for (int i = 0; i < test_case->compiler_args.length; i += 1) {
+            printf(" %s", test_case->compiler_args.at(i));
+        }
+        printf("\n");
+        printf("%s\n", buf_ptr(&program_stderr));
+        exit(1);
+    }
+
+    if (!buf_eql_str(&program_stdout, test_case->output)) {
+        printf("\n");
+        printf("==== Test failed. Expected output: ====\n");
+        printf("%s\n", test_case->output);
+        printf("========= Actual output: ==============\n");
+        printf("%s\n", buf_ptr(&program_stdout));
+        printf("=======================================\n");
+        exit(1);
+    }
+}
+
+static void run_all_tests(void) {
+    for (int i = 0; i < test_cases.length; i += 1) {
+        TestCase *test_case = test_cases.at(i);
+        printf("Test %d/%d %s...", i + 1, test_cases.length, test_case->case_name);
+        run_test(test_case);
+        printf("OK\n");
+    }
+    printf("%d tests passed.\n", test_cases.length);
+}
+
+static void cleanup(void) {
+    remove(tmp_source_path);
+    remove(tmp_exe_path);
+}
+
+int main(int argc, char **argv) {
+    add_all_test_cases();
+    run_all_tests();
+    cleanup();
+}

@@ -33,17 +33,30 @@ set(ZIG_SOURCES
     "${CMAKE_SOURCE_DIR}/src/os.cpp"
 )
 
+set(TEST_SOURCES
+    "${CMAKE_SOURCE_DIR}/src/buffer.cpp"
+    "${CMAKE_SOURCE_DIR}/src/util.cpp"
+    "${CMAKE_SOURCE_DIR}/src/os.cpp"
+    "${CMAKE_SOURCE_DIR}/test/standalone.cpp"
+)
+
+
 set(CONFIGURE_OUT_FILE "${CMAKE_BINARY_DIR}/config.h")
 configure_file (
     "${CMAKE_SOURCE_DIR}/src/config.h.in"
     ${CONFIGURE_OUT_FILE}
 )
 
+include_directories(
+    ${CMAKE_SOURCE_DIR}
+    ${CMAKE_BINARY_DIR}
+    "${CMAKE_SOURCE_DIR}/src"
+)
+
 set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -Wno-unused-variable -Wno-unused-but-set-variable")
 
 set(EXE_CFLAGS "-std=c++11 -fno-exceptions -fno-rtti -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -Werror -Wall -Werror=strict-prototypes -Werror=old-style-definition -Werror=missing-prototypes")
 
-
 add_executable(zig ${ZIG_SOURCES})
 set_target_properties(zig PROPERTIES
     COMPILE_FLAGS ${EXE_CFLAGS})
@@ -52,3 +65,8 @@ target_link_libraries(zig LINK_PUBLIC
 )
 install(TARGETS zig DESTINATION bin)
 
+add_executable(run_tests ${TEST_SOURCES})
+target_link_libraries(run_tests)
+set_target_properties(run_tests PROPERTIES
+    COMPILE_FLAGS ${EXE_CFLAGS}
+)

@@ -31,7 +31,6 @@ readable, safe, optimal, and concise code to solve any computing problem.
 
 ## Roadmap
 
- * Unit tests.
  * C style comments.
  * Simple .so library
  * Multiple files
@@ -66,7 +65,7 @@ Root : many(TopLevelDecl) token(EOF)
 
 TopLevelDecl : FnDef | ExternBlock
 
-ExternBlock : many(Directive) token(Extern) token(LBrace) many(FnProtoDecl) token(RBrace)
+ExternBlock : many(Directive) token(Extern) token(LBrace) many(FnDecl) token(RBrace)
 
 FnProto : token(Fn) token(Symbol) ParamDeclList option(token(Arrow) Type)
 
@@ -96,3 +95,13 @@ FnCall : token(Symbol) token(LParen) list(Expression, token(Comma)) token(RParen
 
 Directive : token(NumberSign) token(Symbol) token(LParen) token(String) token(RParen)
 ```
+
+### Building
+
+```
+mkdir build
+cd build
+cmake ..
+make
+./run_tests
+```